gpt-5-6-terraGPT-5.6 Terra is designed for workloads that balance intelligence and cost — the mini tier of the GPT-5.6 family. It offers higher reasoning at fast speed, text + image input and text output, a 1,050,000-token context window, 128,000 max output tokens, reasoning-token support, and a Feb 16 2026 knowledge cutoff. Live on API Models over both /v1/chat/completions and /v1/responses: $0.551 input / $3.309 output per 1M tokens (cached input $0.055) — exactly half of GPT-5.6 Sol, and about 78% below OpenAI's own $2.5 / $15 list. One API key for every model, reachable from China, only successful requests billed.
The mini tier — strong reasoning at a fraction of the frontier price
Seven levels: gpt-5.6-terra plus -low / -medium / -high / -xhigh / -max / -ultra, all one price
Text + image input, text output; 1.05M context, 128K max output
OpenAI-compatible /v1/chat/completions and /v1/responses; $0.551 / $3.309 per 1M
View complete API reference with all parameters and examples.
Enable real-time streaming responses with Server-Sent Events.
{
"model": "gpt-5-6-terra",
"stream": true,
"messages": [...]
}Enable the model to use tools and call functions.
{
"model": "gpt-5-6-terra",
"tools": [{
"type": "function",
"function": {
"name": "get_weather",
"description": "Get current weather for a location",
"parameters": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City name"}
},
"required": ["location"]
}
}
}],
"messages": [{"role": "user", "content": "What's the weather in Tokyo?"}]
}Get structured JSON responses from the model.
{
"model": "gpt-5-6-terra",
"response_format": {"type": "json_object"},
"messages": [{"role": "user", "content": "Extract info as JSON: John is 30 years old"}]
}| Parameter | Type | Required | Description |
|---|---|---|---|
| model | string | Yes | Model identifier (e.g., gpt-5-6-terra) |
| messages | array | Yes | Array of message objects with role and content |
| max_tokens | integer | No | Maximum tokens in the response |
| stream | boolean | No | Enable streaming responses (SSE) |
| temperature | number | No | Sampling temperature (0.0 - 2.0) |
| top_p | number | No | Nucleus sampling threshold (0.0 - 1.0) |
| tools | array | No | Function calling tools definition |
| response_format | object | No | Output format (e.g., json_object) |
View complete API reference with streaming, thinking, and more.
Billing: Cost = (input_tokens * input_price + output_tokens * output_price) / 1,000,000
GPT-5.6 Terra is a Large Language Model API provided by OpenAI. GPT-5.6 Terra is designed for workloads that balance intelligence and cost — the mini tier of the GPT-5.6 family. It offers higher reasoning at fast speed, text + image input and text output, a 1,050,000-token context window, 128,000 max output tokens, reasoning-token support, and a Feb 16 2026 knowledge cutoff. Live on API Models over both /v1/chat/completions and /v1/responses: $0.551 input / $3.309 output per 1M tokens (cached input $0.055) — exactly half of GPT-5.6 Sol, and about 78% below OpenAI's own $2.5 / $15 list. One API key for every model, reachable from China, only successful requests billed. Through API Models platform, you can access this model via a unified API with transparent pay-as-you-go pricing. Current pricing: Input: $0.551, Output: $3.309 per 1M tokens.
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GPT-5.6 Terra is available through API Models at: Input: $0.551, Output: $3.309 per 1M tokens. Billing is pay-as-you-go — you only pay for what you generate.
Sign up at API Models, get your API key, and call our unified API endpoint. We provide detailed API documentation with code examples in cURL, Python, and Node.js.
API Models offers the same GPT-5.6 Terra model through our aggregation platform. We provide a unified API interface so you do not need separate accounts for each provider - one API key to access all models.
GPT-5.6 Terra is the mini tier of the GPT-5.6 family, built to balance intelligence and cost — higher reasoning at fast speed, text + image input, a 1,050,000-token context, 128,000 max output, reasoning-token support, Feb 2026 cutoff. On apimodels.app it is $0.551 per 1M input and $3.309 per 1M output (cached input $0.055) — exactly half of GPT-5.6 Sol, and roughly a fifth of OpenAI's own $2.5 / $15 list.
Point base_url at https://apimodels.app/api/v1 and set model to gpt-5.6-terra. Both OpenAI-compatible endpoints work — /v1/chat/completions and /v1/responses — so openai-python, Cherry Studio, Cursor and friends work as-is. To change reasoning depth, switch the suffix: -low, -medium, -high, -xhigh, -max, -ultra, all at the same per-token price. One API key for every model, reachable from China, only successful requests billed.
Requests whose input exceeds 272,000 tokens are billed end-to-end at $1.102 input / $4.964 output (2× input, 1.5× output), matching the upstream long-context rate step. Reasoning tokens count as output tokens.
Terra is the middle tier: exactly half the price of Sol ($0.551/$3.309 against $1.103/$6.618), balancing intelligence and cost, and plenty for everyday chat, coding and agentic tool calling. Pick Sol for maximum reasoning; pick Luna for cost-sensitive, high-volume work ($0.221/$1.324, a fifth of Sol). All three share one OpenAI-compatible endpoint on apimodels.app — switch by changing a single model name, no code changes.
Three worth knowing. Upstream injects a ~1,450-token system preamble into every request, so usage.input_tokens never drops below that floor even for a one-line prompt. `parallel_tool_calls: false` is ignored upstream, so the model may still return several tool_calls in one turn — write your handler to cope with more than one. And input above 272,000 tokens rebills the whole request at 2× input / 1.5× output. Otherwise text + image input, function calling (tools), streaming and /v1/responses all work normally.
On API Models, GPT-5.6 Terra runs alongside 60+ models on one API key and one balance, so choosing is about fit, not lock-in. It supports Balanced、Higher Reasoning、Fast、1.05M Context, and you can weigh it on price and capability against other Large Language Model models, then switch by changing a single model-name string — no new account or integration. Browse every Large Language Model option with live pricing at apimodels.app/models.
GPT-5.6 Terra supports: Balanced、Higher Reasoning、Fast、1.05M Context. See the API Models docs for full parameters and call examples.
Yes. API Models exposes GPT-5.6 Terra through a single unified API and one key — no separate provider accounts, and no need to handle each provider's regional network access yourself.
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